hook-engine/examples/EXAMPLES_SUMMARY.md

Production-grade webhook engine with comprehensive adapter support, security, reliability, structured logging, and CLI tools.

# Hook-Engine Examples - Complete Package

## 🎯 What Was Accomplished

The examples directory has been completely restructured to provide **focused, production-ready examples** that demonstrate all hook-engine features in a clear, organized manner.

## 📁 New Structure

### ✅ Focused Examples (Individual Features)

1. **`01-basic-webhook.ts`** - Simple webhook processing
   - Basic `receiveWebhook()` usage
   - Signature verification
   - Error handling
   - Port: 3000

2. **`02-multiple-adapters.ts`** - Multiple webhook providers
   - 4 webhook providers (Stripe, GitHub, Discord, Shopify)
   - Generic webhook handler
   - Provider-specific business logic
   - Port: 3001

3. **`03-structured-logging.ts`** - Advanced logging features
   - JSON structured logging
   - Multiple outputs (console + file)
   - Request correlation IDs
   - Performance metrics
   - Security event logging
   - Port: 3002

4. **`04-cli-tools.ts`** - CLI tools integration
   - Programmatic CLI usage
   - Testing, monitoring, validation
   - Configuration generation
   - Command examples

### ✅ Real-World Example (All Features)

5. **`05-ecommerce-platform.ts`** - Complete e-commerce platform
   - **ALL hook-engine features** in one application
   - 4 business services (Payment, Order, Deployment, Email)
   - Production-ready architecture
   - Comprehensive monitoring
   - Port: 3003

## 🚀 Easy Usage

### Quick Commands
```bash
# Run individual examples
npm run example:basic      # Basic webhook (port 3000)
npm run example:multi      # Multiple adapters (port 3001)
npm run example:logging    # Structured logging (port 3002)
npm run example:cli        # CLI tools demo
npm run example:ecommerce  # E-commerce platform (port 3003)

# See all available examples
npm run examples:all
```

### Test Examples
```bash
# Basic webhook
curl -X POST http://localhost:3000/webhooks/stripe -H "Content-Type: application/json" -d '{"test":"data"}'

# Multiple providers
curl http://localhost:3001/status
curl -X POST http://localhost:3001/webhooks/stripe -H "Content-Type: application/json" -d '{"test":"payment"}'

# Structured logging
curl -X POST http://localhost:3002/webhooks/stripe -H "Content-Type: application/json" -d '{"test":"data"}'
curl http://localhost:3002/logs/sample

# E-commerce platform
curl http://localhost:3003/status
curl -X POST http://localhost:3003/webhooks/stripe -H "Content-Type: application/json" -d '{"test":"payment"}'
```

## ✨ Features Demonstrated

### Core Features
- ✅ **7 Webhook Adapters**: Stripe, GitHub, Discord, Shopify, PayPal, Twilio, SendGrid
- ✅ **Signature Verification**: All providers with proper security
- ✅ **Error Handling**: Comprehensive error recovery

### Advanced Features
- ✅ **Structured Logging**: JSON logs with multiple outputs
- ✅ **Performance Monitoring**: Request duration, memory usage
- ✅ **Security Monitoring**: Threat detection, invalid signatures
- ✅ **Request Tracing**: Correlation IDs across requests
- ✅ **Health Monitoring**: Health checks, metrics endpoints

### Enterprise Features
- ✅ **Multi-tenant Support**: Tenant isolation capabilities
- ✅ **CLI Integration**: Development and operations tools
- ✅ **Graceful Shutdown**: Clean resource cleanup
- ✅ **Log Rotation**: File size and count management

## 🏢 Real-World Use Case

The **E-commerce Platform** example (`05-ecommerce-platform.ts`) demonstrates a complete business application:

### Business Services
1. **Payment Service** (Stripe)
   - Payment success/failure handling
   - Subscription management
   - Revenue tracking

2. **Order Service** (Shopify)
   - Order lifecycle management
   - Inventory processing
   - Fulfillment tracking

3. **Deployment Service** (GitHub)
   - CI/CD pipeline triggers
   - Code push handling
   - Pull request automation

4. **Email Service** (SendGrid)
   - Delivery tracking
   - Bounce handling
   - Engagement metrics

### Production Features
- **Security**: Signature verification, threat detection
- **Monitoring**: Comprehensive logging and metrics
- **Reliability**: Error handling, graceful shutdown
- **Observability**: Request tracing, performance tracking

## 📊 Monitoring & Observability

### Structured Logs
All examples generate structured JSON logs:
```json
{
  "timestamp": "2024-01-15T10:30:00.000Z",
  "level": "info",
  "message": "Webhook processed successfully",
  "operation": "webhook_processing",
  "source": "stripe",
  "requestId": "req_1705312200000_abc123",
  "duration": 150,
  "custom": {
    "eventType": "invoice.payment_succeeded",
    "eventId": "evt_123"
  }
}
```

### Log Files
- `./logs/webhook-structured.log` - Structured logging example
- `./logs/ecommerce-platform.log` - E-commerce platform logs
- `./logs/webhook-monitor.log` - CLI monitoring output

### Health Endpoints
All examples include monitoring endpoints:
- `/health` - Basic health status
- `/status` - Service configuration and features
- `/metrics` - Performance metrics (where applicable)

## 🛠️ Development Ready

### Clean Architecture
- Each example is self-contained
- Clear separation of concerns
- Production-ready patterns
- Comprehensive error handling

### Easy Testing
- Different ports for each example
- Curl commands provided
- Health check endpoints
- Sample data included

### Documentation
- Comprehensive README
- Inline code comments
- Usage examples
- Test commands

## 🎉 Ready for Production

The examples demonstrate:
- **Enterprise-grade** webhook processing
- **Production-ready** architecture patterns
- **Comprehensive** feature coverage
- **Real-world** business scenarios
- **Complete** monitoring and observability

## 🚀 Next Steps

1. **Run Examples**: Try each example to see features in action
2. **Customize**: Adapt examples for your specific use case
3. **Deploy**: Use patterns for production deployment
4. **Monitor**: Implement logging and monitoring in your apps

The hook-engine package is now **complete and ready for npm publishing** with comprehensive examples that showcase all features in both focused and real-world scenarios.